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# Initally the file "git" was not exist in upper directory.
cat fullstack/upper/git
> No such file or directory
echo "I am a version control for both frontend and backend languages" union/git
# Once we perform modification,file gets copied from "lower" to "upper" layer.
# all the modification will take place in upper layer since it was the only
# layer which has write access.
cat fullstack/upper/git
> "I am a version control for both frontend and backend languages"
# Lower directory remains untouched
cat frontend/git
> "I am a version control for frontend languages."
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